Mirtazapine is an anti-depressant that is believed to work on serotonin and noradrenergic systems. It is not yet well known in the United States. Mirtazapine is. An Experience with MIrtazapine (Zispin SolTab) Apr 2, 2007. erowid.org/exp/61902. DOSE: 30 mg, oral, Pharms - Mirtazapine, (pill, tablet).